, RELATIONS OF BURSARIA TO FOOD 25 



more fundamental morphological changes. A full consideration 

 of these processes will be given at a later time. 



That the presence of the dye also brings about a tendency 

 to an earlier death of the individual is indicated by table 6 (d). 

 The record for this is not complete because when the experiment 

 was stopped a large number of the individuals still remained 

 ahve, as the table indicates. 



It was stated above (p. 11; cf. figs. H, H' and H" to L, L' 

 ari^d L" respectively, plate 1) that the rate of resorption during 

 digestion of vitellin may be equal to, or less than, the rate of 

 solution of the grain. This is a definite and observable condition, 

 for in some cases solution of the grain may go on with the vacuole 

 membrane closely applied to the grain, while in other instances, 

 even in a sister vacuole in the same cell, the process of dissolution 

 of the grain may go on while the latter is floating in the liquid 

 in the vacuole, which is made up, in part at least, of the liquid 

 products of digestion. The quantity of liquid present in such 

 vacuoles during digestion, may vary, and when only a smaller 

 quantity is present around the grain, it becomes more difficult 

 to observe its presence; but, when the quantity is sufficient to be 

 seen, then records may readily be taken giving (practically) the 

 absence, or presence of liquid about the grain. The results from 

 Experiment VI are given in table 6 (e). 



It is evident that there was a much greater tendency toward 

 accumulation of liquid about the unstained grain than in the 

 vacuole having the stained grain. In other words, along with 

 decrease in digestive action upon the stained grains went a strong 

 tendency toward absence of liquid in the vacuole. We have there- 

 fore in this result further good evidence for the essential correct- 

 ness of the statement made above (p. 11) that the rate of diges- 

 tion of the vitelhn may be (1) greater, (2) equal to, or (3) less 

 than the rate or power of resorption. 



Further evidence for this is shown in table 6 (e), for during 

 the height of digestive acitivity, which in this case occurred between 

 six and eleven hours, the tendency toward presence of liquid in the 

 vacuole is greatest. 



